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34
Chapter One
Chemical
Foundations
46.
Apothecaries
(druggists)
use the following
set of measures
in the
English
system:
20 grains ap
=
1 scruple
(exact)
3 scruples
= 1 dram ap (exact)
8 dram ap
=
1 oz ap (exact)
1 dram ap = 3.888 g
a.
Is an apothecary
grain
the same as a troy grain?
(See Exer
cise 45.)
b.
1 oz ap
=
oz troy.
c.
An aspirin
tablet
contains
5.00
X 10
2
mg of active ingredi
ent. What
mass in grains
ap of active ingredient
does it con
tain? What
mass in scruples?
d.
What is the mass of 1 scruple
in grams?
47.
Science
fiction
often
uses
nautical
analogies
to describe
space
travel.
If
the
starship
u.S.S.
Enterprise
is traveling
at warp
factor
1.71, what is its speed
in knots
and in miles
per hour?
(Warp
1.71
= 5.00 times the speed of light;
speed
of light
=
3.00
X 10
8
m/s;
1 knot
=
2000 yd/h, exactly.)
48.
The world record for the hundred meter dash is 9.74 s. What is the
corresponding
average speed in units of
mis,
km/h, ft/s, and miIh?
At this speed, how long would
it take to run 1.00 X 10
2
yards?
49.
Would
a car traveling
at a constant
speed
of 65 krnIh violate
a
40. miIh speed limit?
50.
You pass a road sign saying
"New York 112 km." If you drive
at a constant
speed of 65 mi/h,
how long should
it take you to
reach
New York? If your
car gets 28 miles
to the gallon,
how
many liters of gasoline
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This note was uploaded on 12/13/2010 for the course CHEM 2301 taught by Professor Bill during the Spring '10 term at South Texas College.
 Spring '10
 bill
 Organic chemistry

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